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Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Feb. 28, 2018
Aug. 31, 2017
Feb. 28, 2017
Debt Instrument [Line Items]      
Total debt $ 116,876 $ 116,976 $ 117,075
Less current portion (203) (201) (199)
Total long-term debt 116,673 116,775 116,876
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Total debt
Elecsys Series 2006A Bonds [Member]      
Debt Instrument [Line Items]      
Total debt 1,876 1,976 2,075
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Total debt $ 115,000 $ 115,000 $ 115,000